jQuery获取表格第一列的值

[!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
[html xmlns="http://www.w3.org/1999/xhtml" >
[head>
[title>无标题页[/title>
[script src="js/jquery-1.4.2.min.js" type="text/javascript">[/script>
[script type="text/javascript">
$(function(){
$("#Button1").click(function(){
var cols="";
$("#tb tr").each(function(){
var text = $(this).children("td:first").text();
cols+=text+"|";
})
cols=cols.length>0?cols.substring(0,cols.length-1):"";
alert(cols);
})
})
[/script>
[/head>
[body>
[input id="Button1" type="button" value="button" />
[table id="tab1" border="1" style="width:100%;">
[tr>
[th>Id[/th>
[th>Name[/th>
[th>Address[/th>
[/tr>
[tbody id="tb">
[tr>
[td>11[/td>
[td>leaf[/td>
[td>gz[/td>
[/tr>
[tr>
[td>22[/td>
[td>flower[/td>
[td>gz[/td>
[/tr>
[/tbody>
[/table>
[/body>
[/html>